Alzheimer's is the neuro degenerative disorder in which the nerve cells of the body starts digressed or destroyed. This disease also cause dementia that causes the loss of thinking and memory ability.
This disorder shows early symptoms like forgetting the events and small memory. This disease becomes worst with the increasing age. The neurotransmitter causes the decrease in acetylcholine neurotransmitter that plays an important role in the chemical signal transmission.
The answer is cancer. Cancer is an uncontrolled division of cells. The regulation of cell cycle is necessary for normal cell division. The first phase of the cell cycle is the G1 phase. If the G1 phase is affected, mistakes in this process lead to the uncontrolled division of cells called cancer.